(19)

(11)

EP 2 773 836 A2

(12)

(88) Date of publication A3: 23.01.2014 (43) Date of publication: 10.09.2014 Bulletin 2014/37 (21) Application number: 12787979.9 (22) Date of filing: 25.10.2012

(51) International Patent Classification (IPC):  E21B 7/06(2006.01) (86) International application number: PCT/US2012/061774 (87) International publication number: WO 2013/066695 (10.05.2013 Gazette 2013/19)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 04.11.2011 US 201113289729 (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventor: CHEN, Shilin Montgomery, Texas 77356 (US) (74) Representative: King, Lawrence  A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)